Sandaohe syenogranite 三道河正长花岗岩
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It is composed of four rock units, they are gabbro, pyroxene syenite, (quartz) syenite and syenogranite from early to late.
岩性上自早到晚由辉长岩、辉石正长岩、（石英）正长岩和正长花岗岩等四个岩石单元构成。
Therefore, the granitoid is a big group of plutonic rocks including such as granodiorite, monzonite, syenogranite, tonalite, and so on.
因此，花岗岩类是深成岩的一个大类，包括象花岗闪长岩、二长花岗岩、正长花岗岩、英云闪长岩等这样的岩石。
The fine-grained syenogranite of Jinlongqiao Unit is the differentiated lithofacies of this magmatic system, and can serve as the criteria for tin ore-prospecting in this area.
其中的金龙桥单元正长花岗岩是晚期分异相 ，应作为紫金山地区锡矿重要的预测标志。
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